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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '179fa4c03c44f26d58ecb95bdc8642288337e5c4780b42c05c6f672636dcc207' 
  AND token = 'jSsD6ondpAKUDzdYyhji9F+/1jTanaok/fZQdibZEPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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