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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a08edcd09bcc148b06f219a5b7f2853049958702f4caf4fcc04e791d9e517391' 
  AND token = 'evubMe8AczV8IFVKtRexVKfvtNj02Mx5awCUJXyLId0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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