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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8a6eb7bc82d1b676a55d6b854b4d7c2317d53bbab820505868f19cdb7591f8d' 
  AND token = '/+JZyOksjRRcfpxiA6ZddeOUjvFma76VSJ9UYPf0CR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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