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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83e52dbc5ac279dbdb4254d4e70a33024f82d2b1ebbfd61ef70716ff1bd61158' 
  AND token = 'EVDgnBzVP9psB/jrsMMD0N72zue3ZGUpajOTZtu4Ssk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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