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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39fad55f8cefc138ca8c5c812631c1a901ba6e80d43228fcbf893a93eda5e912' 
  AND token = 'a/2pwm9iuVtQ9LnpX5T0sHHvLSb3YKY8xccNDgN5vrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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