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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc86dc9c2b8e108c936d7b95f543f5697323085908ed732108f27612e1c7488a' 
  AND token = 'ASDGo6vRT6TZCjWND8/0+RyHdfJ8E9hkAEol9Ff3SsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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