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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c28b43e68d4da97bb5558790aa704dfe8616228bb2afb68a9768e59b68beeb1' 
  AND token = 'VMSdioRH2yQN2Khk1mXZ7aObz214KeThd+vzUjl/i2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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