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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5cc5178532dd135671dbb608a16e678e3819a3f1870f1e0e00fdf5f8406c4be' 
  AND token = '+13dJ2Q7XzZYVoYuD9UQ4/X6rc4yj90TMHdsx9Re778=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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