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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd640953b97210f1e12cb18c42f1a7d2bae8694aac06f5f98747c8a0c3b59343' 
  AND token = 'BNypYkd4aC3HsKgXkkzETEsf4LvKtDeNyplLbg93vXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}