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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02d486b8d24197b95c053a641dec587053f4905948282ec1e0b1d70e42e9a857' 
  AND token = 'ZP1tcazb+Eevg02lSbIJRJlWk2kOHSoxNDyQnYdpmCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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