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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9aa14d024de973fed8d345a2c2ae113035cdabb744310e6d3b4d2bf41a99c5c' 
  AND token = 'br11DiNDhMihA5lSxC7yIAx4jEnqm6LHS3Pu0M6B8l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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