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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3b085e23afdb53926ad86f70cbecea942e23726690d2b8c8307763f55cc5fdc' 
  AND token = 'Ba3K3s6wLjTgzTlpLFXZzv2kcAsTY2PwQCZsZ7r2URk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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