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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40302b6532ed802df88ce8336942bb8f70b34c1305b9c01d18dc099558fe7761' 
  AND token = 'jYsKAuY0/Knpk0uYf57O6orsDVzXtdaPXx+Fsd4fdNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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