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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe33c3854e5321f0657f0903f85b35cca351d302c5683d284603f4590d5d0c81' 
  AND token = 'LMn7dUwKw+VK3yzG6X5VMoAP5k21CRSGSjrXbzSOuKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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