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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98c27733a6bc8b200407d1d3b40950b103428be38421a6b09c60377c8935ff20' 
  AND token = '3dRnNLo8NsgcO45q8NoiPU/8T53SkdCNEZR4Tpx9Zig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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