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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c88b593fb5806dc363a88308f9b93b83dacd472f349c5356f2cfa3d331d88ee' 
  AND token = 'ZF06IjwpUZAuZDu3u2xgV5FlNH2SfMhKSLmeerp6lyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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