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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6343b55d68cdf49d05be78da665b501e87f1c0bedbe2a9f42d9d49741994e050' 
  AND token = 'IrkgPhX0wObUEUKTKeKVsz1u5Kkk08XEOoL3GTqiOBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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