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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f454c8b294a29fe3737cbca3869f1cecd144c498eec3ebfef9454f82e9ec3fb' 
  AND token = '4446/FbAik+OzY58igy4+YTCp/Nx/vK0jT9A2nm75w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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