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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e2b7ed62afa61b7ae2c84a205b3ba9b6debcce266f6b53de358f2e6e17e7f0e' 
  AND token = 'hcgfdnMjSaKxWOQiDJm3VGmnHevm/aUFdsRV4MD4f80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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