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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbe529189f1cfcde167880b0a94572223a6a02d0da20080bbf865f758e175128' 
  AND token = 'X9hgLnRT9K8NI6zTBtr0H8T8emGfKDxLRVaOAkSL2II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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