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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76d9662950c1d759c64cd14b6709134fea4dea88b8090a9d141fea38c1fbefcc' 
  AND token = '/4LdS1HeGcPLt+sBGHQzHXorHjUAIWPJLC5i4AEPX5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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