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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd28813fe3dfa0db2a79ef8e62a2203f1ca7af82530cf3ba2b987662736b4597' 
  AND token = 'WXLiwPgLWTvDp1utEi3t6wiEVAWBIsh+AK36rpQo32k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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