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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09c521cec3c5fb1eff303dacd58ae901a7142a16de184fd18e7a8674501312e6' 
  AND token = '7Dwyzg3xmTUAPT8FscRLmXq4FWlVrptv3vgNq4qRCds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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