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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '993e1e983f93632636b1c525f8145674a6c3032b805da2fe130a913ecb68ceee' 
  AND token = 'sR2oOZc0mZsWNAoC2gyZggvUEXPFQb+ClflJdXbszLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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