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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a595c1ff03f6156ca82e7e3460d3cd7815c61917d34b95e51535cca753fe969a' 
  AND token = 'sL3xRIRHsiPWTOI0iF2Bv3pYxBYpRSvdMEDWMeZm/wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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