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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c12f05e9a1b16fe6afb29a30c893ee24e376482eb5ea09db9af2ace6ea3ad8c' 
  AND token = 'FqxkKJ9QObvQvHipGgKTSYygfNPCcW4sf2lkI1KXr+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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