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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30789ac11b2f6b22bbf379bbf9c54af039189c4290e0900d582e6aaab95c36a8' 
  AND token = 'subaPM4VomKIbiU82ytaKo6aDUVhEEIGfZQb0YNR1bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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