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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f25c08ddd1394f4aa2ca1b53ae51095027c9601be2c80195547c3cd9ddd158d' 
  AND token = 't3jC2tjQM54JHMRlaPMXE/nPpqkARVhfbKSqmB1ChQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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