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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d2d16bf92fc1f47a52f503614ab20eb08bdd11611e4c1f0ed252315c0256dbc' 
  AND token = 'S4QUNB1kwJL0yP6AABUbhFh1loiuF36IGjFl5C0ftdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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