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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6e01aae6c79fda10665ad830c89f6d9fd2d6ad3a43df329a2515eb21e702b1d' 
  AND token = 'fIzlmK111xYZxEYRNJfj+muvRO5aUbLMRy/Qr4kgTGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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