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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd7111b14cb3e78ce869f2cfc0d9358b5c7c3c89eb5e1adb14840e29482aa251' 
  AND token = 'TIUWtQiXCT7N2f2+ZXLvljROH0fui8kjhW1z7BNejP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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