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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e28e58fef91802af5aab5f08ea036acbc48a17de2bb0112e955431aa59b44703' 
  AND token = 'fuvqaQaRql3SkreBtkdK5wHIw31co8nUOdLW3Nti8Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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