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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1b94e82ee9f6c7567e403bd94f1b5359b2f2fceac9c1ba1d322151f43ec4c8a' 
  AND token = '4WYr+z5Urb+yeggOZE8518HZTVCZ0i0clsafmAsEr4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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