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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f1011ddda4977319d9bf95a0a7aba549855317c9d3577161e0fc17461e0c9f6' 
  AND token = 'Y1q1mtu9pn72gim26ZzdjjwKn+p5BWpwEtujEN/vPWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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