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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a075f29d9e1c1ba99f42ad35e8b7eb958c98ee3b12aa7a48910a98e089ce4dd' 
  AND token = 'tcB6ub9SFxBgmhajxEHErZfdFMDWp/8HF6454qo57Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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