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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd73752629052d233e2ee238c634dc38c45514311fced5ceed6137ce427ab5aa8' 
  AND token = 'LkOjS04waZ0RA9bu+K5sJXitWoEO2k9oJgwmwcix/Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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