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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d4d0b89ce56a9da8ec5ea77c557a122a6a399b526bdfde2ece601e9eb949ba4' 
  AND token = 'PdZdvjs1Ox7cLBQZOh8otxKLcDX0LL/FKwzSSTOWOfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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