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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1afc23aa55420cc907a2e911d09947d481c352fb3492f5a7f4f19d5e29bd777f' 
  AND token = 'fnL5tPb3Wjw/COGlQ8ktt0mgab7+DRZGbcKGrQRowXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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