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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '78893918206830c5d8ef2697f9da4569b86945ecc87592f51894e303448ec28f' 
  AND token = 'Kp6PL7TkPt2lOxvF9GKX5HHhzKbCk2SNB5yDrHPc1mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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