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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3696d986e906de2c79811fa8a815f2f8371ad0c8e1ee8b181d3ae601b936271' 
  AND token = 'ctTc1oJefeRXXaGHkjKZfvwoli/2jk4Ts2pt7gGxVQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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