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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebb411e5dcd22ee61baae9dc27cc3c6372376f9b9e46a94ddeb978aca0fa0e75' 
  AND token = 'vsWDSJ3mDr2H2j/y6MWtAwpZn9enJ+orvTflBCkn8C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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