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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01012850c2a5299a709fb6ae564b85d937239cac4598f34d5743c62a71529831' 
  AND token = 'TZdbuMAyY1ciEIACOk+liQ5+kzHBIC/2r2ZrspY3xOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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