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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd96b081e30eb06d468dd492754a66a839319305409eef14c4849ed630b85209a' 
  AND token = 'fJVw92N25805SKLboFfwTNaEla3kCeRvsVw4zRMMItY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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