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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3af6a18d2e21597dfcedb97523e1bf2a575daa9a0469778913489a1daaa2f5d' 
  AND token = '3ciyIVZNoKq84Nk4DNb6s/a6TQa/6Moyl2UM9VZnezA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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