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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47d755a851a0adde0a95012a1e1d172f25b501ae214b3f5bd7feae445b3f1c62' 
  AND token = 'INbljY6/rieGZloNaHETcEm5mftwgHmpmIU92+3WQ44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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