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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d78fd0e144564a395d37365dc79e4c03c108ec4e0b7d447ab8c74c89a3356cb' 
  AND token = 'AZaXLc78Cq1JyqEsN5Eau9ZSqhE9T0Ns5BLWewnnpPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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