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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '852db17e6791701a42f7dca0550dd0080593abfc5fc27556f15201b622ec3569' 
  AND token = 'EdQ3qWazPz6UKciI1iNnLveaP5O+SXcPVYqQ3NWqXJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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