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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c683e0b0fef72bc74c773a8051e41836ae60c06082a55c62fe9b59eec1b86eef' 
  AND token = 'Oh+Mh43bQB9JvutYpbHzhGOycop88hTGdmRD97hKT2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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