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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b05086089720262fe4e112dec11dc502b338d244563ec12a6c1980cfd2424b62' 
  AND token = 'hktEJqKFFkmunuE4TRopWz1r4snaCoHpqKxl6wGYQns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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