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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00d6beec7c5de49c803b5b4172db141e87f5f70a5c6d64f76b19568f22e67f5c' 
  AND token = 'N5O41KPtBN3bLiL+Q/ZR0LlQXzxdmy60fSbiYsywAxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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