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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ffb2cb2a2e92a8a7648e9ba32a0f32d45cb924c44f5fa1c14032c8223f42016' 
  AND token = 'TcjHaKo6NqJrjPYmtOW2LeQpX0oTtTD/0obiWvyLXkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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