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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71752a2f17153e6cbdd90e1ade9534e5e6e983800f253e56de1b0679d1d3fca1' 
  AND token = 'C10IC/q9gRu76Ym3LG5SkTbvaYu7W3MHqyd/aMPe8eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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