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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd695ba0c73adee341f91bf3a26d1267b362e334fdd22a5e12817596bf30afa97' 
  AND token = 'pDuvIv/f1r4c78hUihlfBPETx6H85OU9LyM+fBxHjI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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