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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a11774b47fbb2492cf936c46201d84fa2172881b495a8b78105b0d2d204c3427' 
  AND token = 'E7fcCHYh0H4HNyyUxNB4732+v1Wub/IG5j7QaivdbpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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