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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef4e470288a2092efd255d1a06a64976677a2218ed9297c375c2439909f8ff0e' 
  AND token = 'ASyAkse/pRp+WYdYQZflS8gPGofxe997YRZGzbPuJwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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