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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2add3b0170b0fa31d698af472e731fe9713355ba3a51f1aabdb8b340c52f423' 
  AND token = '0cM2hsk++Aj8YseLffiA+POI30f3E3IJidUgYqiNWHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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