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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '901901cb606b657aa7ba8d024103c6bed1fd8736b29d4fe0593decfde83b2930' 
  AND token = 'DtCEJNB2AIGA1GNGYjyy2cAYurSah/5WskCpDZ6VavI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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