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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7d8583a65cf9d52a638c921eb6459585eec3f088b10d4ef61cab333d2e8fc54' 
  AND token = 'kkuqnUs3zLLmSS7OfSknxViyilYX3SXQTeUTue+ht6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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