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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f07c4a5bfadf35e2c6f815faccc0b59a37345630ec4508a34e58791c3f19210' 
  AND token = 'IWxcDVcYzvpv84T3m2bv+KtAIbSNFWH1f+NR3Q+Evqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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