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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67e20159941bdd284727c68b8054c4c87ad830ecf147c9f1d8598cf08f290345' 
  AND token = 'Wboj8din1V2dcQrFUEz9+9NrrdYvumhTuJvIY74pqfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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