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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2a1bed2d002224faaa68151a5d99f6bf597fb1944b26b646df81ec672e961f4' 
  AND token = 'BNWk7M+9Z4OuWEFwH2f7BFK4hwFSSVEySA1T7HlnPO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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